IWC Schaffhausen 4590 Mode D'emploi page 22

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NOTE
If your watch has a strap made of leather, textile or rubber with a leather or textile inlay, make
sure that the high-quality strap does not come into contact with water, oily substances, solvents,
cleaning agents or cosmetic products. This way you can prevent discoloration and premature
ageing of the material.
HOW OFTEN SHOULD MY WATCH BE SERVICED?
The optimal service cycle for your IWC timepiece is exclusive to your watch and unique lifestyle.
The necessary interval between services will be determined by your individual wearing
habits; frequency of wear, your environment/s, and the intensity of physical activity you engage
in. Your fine mechanical timepiece is an extension of yourself and will run well for as long and
smoothly as it is treated. Therefore, we simply recommend you to continue wearing your watch
for as long as pleases you and to only entrust it for a service if you notice a deviation from the
regular performance, function or timekeeping. It will then be our pleasure to reinstate the
premium performance with the suitable service.
PORTOFINO AUTOMATIC MOON PHASE 37/PORTOFINO AUTOMATIC MOON PHASE 40